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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | Feb. 28, 2014 | May 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 101,043 | $ 105,483
Available-for-Sale Securities, Gross Unrealized Gains | 12,839 | 8,644
Available-for-Sale Securities, Gross Unrealized Losses | (1,768) | (1,034)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 112,114 | 113,093
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 80,812 | 83,094
Available-for-Sale Securities, Gross Unrealized Gains | 12,438 | 8,089
Available-for-Sale Securities, Gross Unrealized Losses | (1,450) | (891)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 91,800 | 90,292
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 984 | 1,090
Available-for-Sale Securities, Gross Unrealized Gains | 533 | 244
Available-for-Sale Securities, Gross Unrealized Losses | (32) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,485 | 1,334
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,929 | 24,492
Available-for-Sale Securities, Gross Unrealized Gains | 8,307 | 5,265
Available-for-Sale Securities, Gross Unrealized Losses | (244) | (392)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 38,992 | 29,365
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 6,329 | 18,328
Available-for-Sale Securities, Gross Unrealized Gains | 1,798 | 1,901
Available-for-Sale Securities, Gross Unrealized Losses | (8) | (7)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 8,119 | 20,222
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 42,570 | 39,184
Available-for-Sale Securities, Gross Unrealized Gains | 1,800 | 679
Available-for-Sale Securities, Gross Unrealized Losses | (1,166) | (492)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 43,204 | 39,371
Fixed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 20,231 | 22,389
Available-for-Sale Securities, Gross Unrealized Gains | 401 | 555
Available-for-Sale Securities, Gross Unrealized Losses | (318) | (143)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,314 | 22,801
Fixed securities | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 18,424 | 20,528
Available-for-Sale Securities, Gross Unrealized Gains | 142 | 247
Available-for-Sale Securities, Gross Unrealized Losses | (318) | (139)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 18,248 | 20,636
Fixed securities | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,683 | 1,724
Available-for-Sale Securities, Gross Unrealized Gains | 200 | 244
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,883 | 1,968
Fixed securities | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 37 | 37
Available-for-Sale Securities, Gross Unrealized Gains | 3 | 4
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 40 | 41
Fixed securities | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 87 | 100
Available-for-Sale Securities, Gross Unrealized Gains | 56 | 60
Available-for-Sale Securities, Gross Unrealized Losses |  | (4)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 143 | $ 156

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